Join IIUG
 for   
 

Informix News
18 Nov 13 - ZDNet - Top 20 mobile skills in demand... Read
09 Sep 13 - telecompaper - Shaspa and Tatung have shown a new smart home platform at Ifa in Berlin. Powered by the IBM Informix software... Read
06 Sep 13 - IBM data magazine - Mission Accomplished - Miami, Florida will be the backdrop for the 2014 IIUG Informix Conference... Read
01 Feb 13 - IBM Data Magazine - Are your database backups safe? Lester Knutsen (IBM Champion) writes about database back up safety using "archecker"... Read
14 Nov 12 - IBM - IBM's Big Data For Smart Grid Goes Live In Texas... Read
3 Oct 12 - The Financial - IBM and TransWorks Collaborate to Help Louisiana-Pacific Corporation Achieve Supply Chain Efficiency... Read
28 Aug 12 - techCLOUD9 - Splunk kicks up a SaaS Storm... Read
10 Aug 12 - businessCLOUD9 - Is this the other half of Cloud monitoring?... Read
3 Aug 12 - IBM data management - Supercharging the data warehouse while keeping costs down IBM Informix Warehouse Accelerator (IWA) delivers superior performance for in-memory analytics processing... Read
2 Aug 12 - channelbiz - Oninit Group launches Pay Per Pulse cloud-based service... Read
28 May 12 - Bloor - David Norfolk on the recent Informix benchmark "pretty impressive results"... Read
23 May 12 - DBTA - Informix Genero: A Way to Modernize Informix 4GL Applications... Read
9 Apr 12 - Mastering Data Management - Upping the Informix Ante: Advanced Data Tools... Read
22 Mar 12 - developerWorks - Optimizing Informix database access... Read
14 Mar 12 - BernieSpang.com - International Informix User Group set to meet in San Diego... Read
1 Mar 12 - IBM Data Management - IIUG Heads West for 2012 - Get ready for sun and sand in San Diego... Read
1 Mar 12 - IBM Data Management - Running Informix on Solid-State Drives.Speed Up Database Access... Read
26 Feb 12 - BernieSpan.com - Better results, lower cost for a broad set of new IBM clients and partners... Read
24 Feb 12 - developerWorks - Informix Warehouse Accelerator: Continuous Acceleration during Data Refresh... Read
6 Feb 12 - PRLOG - Informix port delivers unlimited database scalability for popular SaaS application ... Read
2 Feb 12 - developerWorks - Loading data with the IBM Informix TimeSeries Plug-in for Data Studio... Read
1 Feb 12 - developerWorks - 100 Tech Tips, #47: Log-in to Fix Central... Read
13 Jan 12 - MC Press online - Informix Dynamic Server Entices New Users with Free Production Edition ... Read
11 Jan 12 - Computerworld - Ecologic Analytics and Landis+Gyr -- Suitors Decide to Tie the Knot... Read
9 Jan 12 - planetIDS.com - DNS impact on Informix / Impacto do DNS no Informix... Read
8 Sep 11 - TMCnet.com - IBM Offers Database Solution to Enable Smart Meter Data Capture... Read
1 Aug 11 - IBM Data Management Magazine - IIUG user view: Happy 10th anniversary to IBM and Informix... Read
8 Jul 11 - Database Trends and Applications - Managing Time Series Data with Informix... Read
31 May 11 - Smart Grid - The meter data management pitfall utilities are overlooking... Read
27 May 11 - IBM Data Management Magazine - IIUG user view: Big data, big time ( Series data, warehouse acceleration, and 4GLs )... Read
16 May 11 - Business Wire - HiT Software Announces DBMoto for Enterprise Integration, Adds Informix. Log-based Change Data Capture... Read
21 Mar 11 - Yahoo! Finance - IBM and Cable&Wireless Worldwide Announce UK Smart Energy Cloud... Read
14 Mar 11 - MarketWatch - Fuzzy Logix and IBM Unveil In-Database Analytics for IBM Informix... Read
11 Mar 11 - InvestorPlace - It's Time to Give IBM Props: How many tech stocks are up 53% since the dot-com boom?... Read
9 Mar 11 - DBTA - Database Administration and the Goal of Diminishing Downtime... Read
2 Feb 11 - DBTAs - Informix 11.7 Flexible Grid Provides a Different Way of Looking at Database Servers... Read
27 Jan 11 - exactsolutions - Exact to Add Informix Support to Database Replay, SQL Monitoring Solutions... Read
25 Jan 11 - PR Newswire - Bank of China in the UK Works With IBM to Become a Smarter, Greener Bank... Read
12 Oct 10 - Database Trends and Applications - Informix 11.7: The Beginning of the Next Decade of IBM Informix... Read
20 Sep 10 - planetIDS.com - ITG analyst paper: Cost/Benefit case for IBM Informix as compared to Microsoft SQL Server... Read
20 Jul 10 - IBM Announcements - IBM Informix Choice Edition V11.50 helps deploy low-cost scalable and reliable solutions for Apple Macintosh and Microsoft Windows... Read
20 Jul 10 - IBM Announcements - Software withdrawal: Elite Support for Informix Ultimate-C Edition... Read
24 May 10 - eWeek Europe - IBM Supplies Database Tech For EU Smart Grid... Read
23 May 10 - SiliconIndia - IBM's smart metering system allows wise use of energy... Read
21 May 10 - CNET - IBM to help people monitor energy use... Read
20 May 10 - ebiz - IBM Teams With Hildebrand To Bring Smart Metering To Homes Across Britain... Read
19 May 10 - The New Blog Times - Misurare il consumo energetico: DEHEMS è pronto... Read
19 May 10 - ZDNet - IBM software in your home? Pact enables five-city smart meter pilot in Europe... Read
17 March 10 - ZDNet (blog) David Morgenstern - TCO: New research finds Macs in the enterprise easier, cheaper to manage than... Read
17 March 2010 - Virtualization Review - ...key components of Big Blue's platform to the commercial cloud such as its WebSphere suite of application ser vers and its DB2 and Informix databases... Read
10 February 2010 - The Wall Street Journal - International Business Machines is expanding an initiative to win over students and professors on its products. How do they lure the college crowd?... Read


End of Support Dates

IIUG on Facebook IIUG on Twitter

[ View Thread ] [ Post Response ] [ Return to Index ] [ Read Prev Msg ] [ Read Next Msg ]

IDS Forum

Re: Informix 12 Unicode

Posted By: Fernando Nunes
Date: Wednesday, 22 October 2014, at 7:50 a.m.

In Response To: Re: Informix 12 Unicode (Martin Fuerderer)

That is good. But I think the issue the OP is facing (which I think is very
common), is that it's impossible to know how many characters we're able to
store in a column, because we don't guarantee that...
This seems to be a fundamental design structure... Big O for example allows
you to specify:

CREATE TABLE ... ( col1 VARCHAR2(30 CHAR))

This means you'll always be able to fit 30 characters, no matter how many
bytes it takes. There is a disclaimer stating that if you do something like:

CREATE TABLE... ( col1 VARCHAR2(4000)) -- 4000 is the "hard limit" of
VARCHAR2.

Then it's not guaranteed that you'll be able to store 4000 characters... it
will accept up to the maximum bytes (4000) allowed in the datatype).
I think big O is also able to "extend" CHAR fields... but I'm not really
sure.

It could be easier to implement this (just for VARCHAR) in Informix....
Since by design (AFAIK) varchar(N) doesn't impose any physical limit on the
row.
My concern is that because our VARCHAR() limit is relatively low (256) that
this could easily lead to columns exceeding the byte limit....

And this, in turn, leads to the other possible discussion about this: We
don't raise an error when the user tries to exceed the limit.....
(INSERTing a VARCHAR(200) in a VARCHAR(100) column). We just truncate the
data without warning.
From my point of view (and I recently had customers complaining about that)
this is an undesirable behavior (not a bug as it works as design).
There is an RFE for this.... and because we raise an error on ANSI
databases, I'd expect this change to classify as "very possible", but
without seeing the code I can only imagine.

So.... in short I would:
1- Open an RFE to request the specification of CHAR (as opposed to bytes)
for variable length fields (VARCHAR/LVARCHAR)
2- Vote for the existing RFE to create a configuration option ($ONCONFIG,
SET ENVIRONMENT....) to force the raise of an error if we insert a
character string that does not fit the column. That RFE is:
http://www.ibm.com/developerworks/rfe/execute?use_case=viewRfe&CR_ID=33830

There seems to be a duplicate (not yet classified as such):

http://www.ibm.com/developerworks/rfe/execute?use_case=viewRfe&CR_ID=53804

Hopefully if the first one gets implemented, R&D will consider my
comments.... I think the original request for a "warning" is not enough. An
error is necessary in order to be useful for existing applications.

Regarding the first RFE, AFIK it's not inserted yet... but a carefull
search would be needed. Implementing it for VARCHAR seems much easier than
for CHAR...
Regards.

On Wed, Oct 22, 2014 at 11:41 AM, Martin Fuerderer <MARTINFU@de.ibm.com>
wrote:

> Hi,
>
> you may use function ifx_gl_mb_loc_max() in
> an application to determine, how "wide" a
> character can be in the current locale.
>
> Regards, Martin
> --
> Martin Fuerderer
> IBM Informix Development Munich, Germany
> Information Management
>
> Read about the Informix Warehouse Accelerator:
> http://tinyurl.com/the-iwa-blog
>
> IBM Deutschland Research & Development GmbH
> Chairman of the Supervisory Board: Martina Koederitz
> Board of Management: Dirk Wittkopp
> Corporate Seat: Boeblingen, Germany
> Reg.-Gericht: Amtsgericht Stuttgart, HRB 243294
>
> From: "MATTI JAATINEN" <matti.jaatinen@norelco.fi>
> To: ids@iiug.org
> Date: 10/22/2014 10:14
> Subject: Re: Informix 12 Unicode [34012]
> Sent by: ids-bounces@iiug.org
>
> Hi,
>
> http://www.iiug.org/forums/ids/index.cgi/read/34002
>
> Char_length return length of the characters in data not the length of
> column. Example you have
>
> column sar1 char(5) and there is row which data is '44'.
> Char_length(sar1)
> return 3 pecause there is 3 characters in that row. Length(sar1) return 4
> pecause there is 4 bytes in that row.
>
> The problem is how to determine how many characted can be put into the
> column
> sar1. Informix reports column size as byte-size so i appears that there is
>
> enought space for 5 characters, but when we use myltibyte characters eq.
> '&#39740;' there can be put only 1-characted into column sar1.
>
>
>
> *******************************************************************************
>
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--
Fernando Nunes
Portugal

http://informix-technology.blogspot.com
My email works... but I don't check it frequently...

--001a113f7d5e6069310506018ca1

Messages In This Thread

[ View Thread ] [ Post Response ] [ Return to Index ] [ Read Prev Msg ] [ Read Next Msg ]

IDS Forum is maintained by Administrator with WebBBS 5.12.